After being friends for six or seven years, "it's very comforting to have someone that knows everything about you, that respects you, understands, has gone through the similar things," Kim says. "I can really relate to his mother passing. He can really relate to my father passing. I mean there [are] so many similarities in our life."

"I feel like I'm at a really happy, good place," Kim adds.

So why did it take so long for the two to get together? Watch a clip from Oprah's Next Chapter:

Part 2 of Winfrey's interview with the Kardashian family airs Sunday at 8/7c on OWN.